/*
 * @文件描述:
 * @版本:
 * @作者: 周晨阳
 * @Date: 2021-01-13 21:52:07
 */

#include "usart.h"
#if BOARD_INUSE == BOARD_STM32

#include "rtthread.h"
#include "Communication.h"
#include "DSP.h"
//标准库需要的支持函数
struct __FILE
{
  int handle;
};

FILE __stdout;
//定义_sys_exit()以避免使用半主机模式
void _sys_exit(int x)
{
  x = x;
}
int fputc(int ch, FILE *f)
{

  USART_SendData(USART1, (uint8_t)ch);

  while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
  {
  }

  return ch;
}
int GetKey(void)
{

  while (!(USART1->SR & USART_FLAG_RXNE))
    ;

  return ((int)(USART1->DR & 0x1FF));
}
static Q USART_RX_BUF; //创建

// static uint8_t bufferReadIndex = 0;
//初始化IO 串口1
//  bound:波特率
void uart_init(u32 bound)
{
  // GPIO端口设置
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOA时钟

  // USART1_TX   GPIOA.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; // PA.9
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
  GPIO_Init(GPIOA, &GPIO_InitStructure);          //初始化GPIOA.9

  // USART1_RX	  GPIOA.10初始化
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;            // PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
  GPIO_Init(GPIOA, &GPIO_InitStructure);                //初始化GPIOA.10

  // Usart1 NVIC 配置
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; //抢占优先级3
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;        //子优先级3
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;           // IRQ通道使能
  NVIC_Init(&NVIC_InitStructure);                           //根据指定的参数初始化VIC寄存器

  // USART 初始化设置

  USART_InitStructure.USART_BaudRate = bound;                                     //串口波特率
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;                     //字长为8位数据格式
  USART_InitStructure.USART_StopBits = USART_StopBits_1;                          //一个停止位
  USART_InitStructure.USART_Parity = USART_Parity_No;                             //无奇偶校验位
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //无硬件数据流控制
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;                 //收发模式

  USART_Init(USART1, &USART_InitStructure);      //初始化串口1
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //开启串口接受中断
  USART_Cmd(USART1, ENABLE);                     //使能串口1

  init(&USART_RX_BUF);
  printf("USART init done...\n");
}
/**
 * @brief :从buffer中获取一个字符
 * @param {*}
 * @return {char} 如果buffer中有数据则返回一个字符，无数据返回0
 */
char USART_getChar()
{
  if (!isempty(&USART_RX_BUF))
    return DeQueue(&USART_RX_BUF);
  else
    return 0;
}

void USART1_IRQHandler(void) //串口1中断服务程序
{
#if SYSTEM_SUPPORT_OS //如果SYSTEM_SUPPORT_OS为真，则需要支持OS.
  rt_interrupt_enter();
#endif
  if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //接收中断
  {
    enQueue(&USART_RX_BUF, USART_ReceiveData(USART1));
  }
#if RT_THREAD //如果SYSTEM_SUPPORT_OS为真，则需要支持OS.
  rt_interrupt_leave();
#endif
}
#endif
